Strong anisotropy in the far-infrared absorption spectra of stretch-aligned single-walled carbon nanotubes

Absorption spectroscopy of stretch-aligned single-walled carbon nanotube (SWNT)/polymer composite films from the terahertz through the visible region of the electromagnetic spectrum reveal that the peak centered near 100 cm(-1) is highly polarized along the tube axis (see figure). This result provides new information on the morphology-dependent low-energy response of SWNTs, and may predict application of SWNTs in the terahertz region.